Head of the Alphadog charity, Marcus Fillinger, has offered an alternative to the kangaroo culls.

Head of the Alphadog charity, Marcus Fillinger, has offered an alternative to the kangaroo culls. Photo: Elesa Kurtz

THE ACT government is considering an offer by an animal rights group to put kangaroos on contraceptives as a way of ending its controversial annual cull.

Kangaroos can be put on the equivalent of birth control drugs to stop them over-populating, effectively ending the need for future culls in the ACT, according to Williamsdale-based organisation Alphadog, which will make a formal offer to the ACT government next week to roll out the program, including an undertaking to shoulder a significant portion of the costs of the program.

Alphadog director Marcus Fillinger said he would write to Minister for Territory and Municipal Services Shane Rattenbury to offer to tranquillise the kangaroos and have the charity's own vets administer the fertility drug deslorelin, which would be slowly released via an implant under the skin. The government would be asked to pay only the cost of the deslorelin drug.

Contraceptives could offer an alternative to the territory's controversial Kangaroo culling program.

Contraceptives could offer an alternative to the territory's controversial Kangaroo culling program. Photo: Supplied

The method is very similar to implants with birth control drugs used by a number of Australian women and administered by GPs.

Mr Rattenbury told the Sunday Canberra Times he would seriously consider the proposal. He said the government had its own fertility program for kangaroos but it was still in the trial phase, using a different drug, and had encountered a hurdle in finding a method to administer it to the population.

Mr Fillinger, whose organisation rescues more than 600 domestic animals and native wildlife each year, said his charity was ready to mobilise immediately.

''Why re-invent the wheel with a different drug when there is a non-lethal, proven and effective solution already available?'' he said.

''Deslorelin is an off-the-shelf, vet-prescribed drug that is easily available for this purpose.''

A CSIRO research paper, titled 'Deslorelin implants in free-ranging female eastern grey kangaroos (Macropus giganteus): mechanism of action and contraceptive efficacy', concluded the drug was successful in reducing fertility in free-ranging female eastern grey kangaroos over three successive breeding seasons.

Mr Rattenbury said the government had not yet decided whether it would hold a kangaroo cull this year.

''The government has undertaken a population count, those numbers are being peer reviewed,'' he said. ''Once those figures are back, a decision will be undertaken.''

Mr Rattenbury said the government would have to consider Alphadog's proposal.

''I have not seen this (proposal) yet, but I will obviously look at it very closely,'' he said.

''The government's overall objective is management of the ecosystems. There are obviously different ways to do that and the approach so far has been culling, but the government has been looking at alternatives including fertility treatment.''